Camphidin and method of preparing same.



No. 727,026. Patented May 5, 1903.

UNITED STATES PATENT FFICE.

JULIUS TAFEL, OF VVIIRZBURG, GERMANY, ASSIGNOR TO C. F. BOEHRINGER & SOEHNE, OF MANNHEIM-WALDHOF, GERMANY, A FIRM.

CAMPHIDIN AND METHOD OF PREPARING SAME.

SPECIFICATION forming part of Letters Patent N 0. 727,026, dated May 5, 1903.

Original application filed April 3, 1901, Serial No. 54,155. Divided and'this application filed August 13, 1902. Serial No. 119, 29- (No specimens.)

To all whom it may concern: cathode employed is a lead cathode prepared Be it known that I, JULIUS TAFEL, a citiaccording to the method given by myself in zen of Germany, residing at Wiirzburg, Ger- Ber't'chte d. Deutschen Uhemt'sche Gesellmany, have invented certain new and useful schctft, Vol. 33, page 2209. After the reduc- 5 Improvements in Camphidin and Method of tion has been completed the major portion of Preparing Same; and I do hereby declare the the sulfuric acid is removed by precipitation following to be a full, clear, and exact dewith calcium carbonate, filtering and extractscription of the invention, such as will enable ing the resultant camphidon from the filtrate others skilled in the art to which it apperby repeated shaking with chloroform. Upon ro tains to make and use the same. thereafter evaporating the chloroform the The present invention relates to the manucamphidon is left as a soft crystalline mass facture of derivatives of camphoric acid, and having a weak or faint camphor-lik'e odor.

more particularly to the preparation of prod- From the acid filtrate, from which the camucts richerin hydrogen thanimido-camphoric phidon has been removed in the manner in- :5 acid. dicated above, the new compound camphidin I have found that by subjecting imido-camis obtained by first supersaturating with an phoric acid, which has the formula O, H, NO alkali, such as soda-lye, and then driving ofi": to electrolytic reduction a new body poorer the camphidin with steam. It is thus obin oxygen and richer in hydrogen and havtained as a light soft crystalline mass having 20 ing the composition O I-I NO may be oban intense camphor-like odor. Its composi- 7o tained, which new compound I term camtion is indicated bytheformula O HI N. At phidon. The reaction proceeds ina manner 188 centigrade it melts to form a colorless similar to that involved in the production of liquid which distils without decomposition at pyrolidon from succinimid. If the reduc- 209 centigrade. It is soluble with consider- 25 tion in the latter case is continued somewhat able difficulty in cold and hot water. It is further, some pyrolidin is concurrently obdistinguished from camphidon by its volatained, as is known. In a similar manner a tility under the influence of steam or aqueous higher hydrated body, which I term camvapor and by its strong basicity. phidin, is formed together with the camphi- The camphidon and its manufacture, While 30 don if the reduction is carried further. described herein for the purposes of a full The camphidin and its method of manudisclosure, are not claimed in this applicafacture are the invention coveredin the prestion, since they are fully described and cut application. claimed in my application, Serial No. 54,155,

The new compound camphidin, which is to filed April 3, 1901, of which this is a divi- 3 5 serve as a pharmacal compound, is prepared sional application. 8 5 in the following manner, which I consider the What I claim, and desire to secure by Letpreferred way of carrying out my invention. ters Patent of the United States, is

One kilogram of imido-camphoric acid is 1. The process which consists in submitdissolved in sufiicient sulfuric acid of sixtytingasolution of imido-camphoric acid in sul- 0 five per cent. strength to make ten liters of furic acid in the cathode-compartment of an solution, which is then poured into the cathelectrolytic cell to the action of the electric ode-compartment of an electrolytic cell or current and then removing the greater porbathf The anode-compartment having been tion of the sulfuric acid and treating the resimilarly charged with dilute sulfuric acid, mainder with chloroform to separate the re- 5 the current is passed through the cell-for sultant camphidon, then supersaturating the 5 three and one-half hours, said current having remainder with an alkali to isolate the cama concentration of strength of one hundred phidin. and twenty amperes per liter of the electro- 2. The process which consists in submitlyteand the cathode-surface being ten square ting a solution of imido-camphoric acid in 50 decimeters perliter of electrolytic bath. The sulfuric acid in the cathode-compartment of 10 Centigrade, to a colorless liquid and distilling I at 209, centigrade, said new compound being a strong base, soluble with difficulty in water, having a camphor-like odor.

In testimony whereof I have affixed my signature in presence of two witnesses.

JULIUS TAFEL.

Witnesses:

F. L. REINOR, WILH. WIsLIooUUs. 

